2122198756861 has 2 divisors, whose sum is σ = 2122198756862. Its totient is φ = 2122198756860.

The previous prime is 2122198756859. The next prime is 2122198756901. The reversal of 2122198756861 is 1686578912212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2120827165636 + 1371591225 = 1456306^2 + 37035^2 .

It is a cyclic number.

It is not a de Polignac number, because 2122198756861 - 2¹ = 2122198756859 is a prime.

Together with 2122198756859, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 2122198756796 and 2122198756805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2122198756261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061099378430 + 1061099378431.

It is an arithmetic number, because the mean of its divisors is an integer number (1061099378431).

Almost surely, 2^{2122198756861} is an apocalyptic number.

It is an amenable number.

2122198756861 is a deficient number, since it is larger than the sum of its proper divisors (1).

2122198756861 is an equidigital number, since it uses as much as digits as its factorization.

2122198756861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5806080, while the sum is 58.

The spelling of 2122198756861 in words is "two trillion, one hundred twenty-two billion, one hundred ninety-eight million, seven hundred fifty-six thousand, eight hundred sixty-one".